Loading...
Searching...
No Matches
gpio_ll.h
Go to the documentation of this file.
1/*
2 * Copyright (C) 2020 Gunar Schorcht
3 * 2021 Otto-von-Guericke-Universität Magdeburg
4 *
5 * This file is subject to the terms and conditions of the GNU Lesser
6 * General Public License v2.1. See the file LICENSE in the top level
7 * directory for more details.
8 */
9
69#ifndef PERIPH_GPIO_LL_H
70#define PERIPH_GPIO_LL_H
71
72#include <assert.h>
73#include <stdbool.h>
74#include <stdint.h>
75
76#include "architecture.h"
77#include "periph/gpio.h"
78#include "periph_cpu.h"
79
80#ifdef __cplusplus
81extern "C" {
82#endif
83
87typedef uintptr_t gpio_port_t;
88
89#if !defined(GPIO_PORT_UNDEF) || defined(DOXYGEN)
93#define GPIO_PORT_UNDEF UINTPTR_MAX
94#endif
95
96#if defined(DOXYGEN)
106# define GPIO_PORT_NUMBERING_ALPHABETIC implementation_specific
107#endif
108
109
110#ifdef DOXYGEN
122#define GPIO_PORT_0 implementation_specific
123
137
152#endif /* DOXYGEN */
153
154#if !defined(HAVE_GPIO_STATE_T) || defined(DOXYGEN)
244#endif
245
246#if !defined(HAVE_GPIO_PULL_T) || defined(DOXYGEN)
257#endif
258
259#if !defined(HAVE_GPIO_PULL_STRENGTH_T) || defined(DOXYGEN)
274#endif
275
286#define GPIO_PULL_NUMOF (1U + (GPIO_PULL_WEAKEST != GPIO_PULL_WEAK) \
287 + (GPIO_PULL_WEAK != GPIO_PULL_STRONG) \
288 + (GPIO_PULL_STRONG != GPIO_PULL_STRONGEST))
289
290#if !defined(HAVE_GPIO_DRIVE_STRENGTH_T) || defined(DOXYGEN)
305#endif
306
315#define GPIO_DRIVE_NUMOF (1U + (GPIO_DRIVE_WEAKEST != GPIO_DRIVE_WEAK) \
316 + (GPIO_DRIVE_WEAK != GPIO_DRIVE_STRONG) \
317 + (GPIO_DRIVE_STRONG != GPIO_DRIVE_STRONGEST))
318
319#if !defined(HAVE_GPIO_SLEW_T) || defined(DOXYGEN)
340#endif
341
350#define GPIO_SLEW_NUMOF (1U + (GPIO_SLEW_SLOWEST != GPIO_SLEW_SLOW) \
351 + (GPIO_SLEW_SLOW != GPIO_SLEW_FAST) \
352 + (GPIO_SLEW_FAST != GPIO_SLEW_FASTEST))
353
372 uint8_t bits;
373 struct {
396 uint8_t : 2; /*< padding */
397 };
398};
399
400#if !defined(HAVE_GPIO_CONF_T) && !defined(DOXYGEN)
401typedef union gpio_conf_minimal gpio_conf_t;
402#endif
403
404#ifdef DOXYGEN
416typedef /* implementation specific */ gpio_conf_t;
417#endif
418
419#ifndef __cplusplus
442static const gpio_conf_t gpio_ll_in = {
443 .state = GPIO_INPUT,
444 .pull = GPIO_FLOATING,
445};
446
452 .state = GPIO_INPUT,
453 .pull = GPIO_PULL_DOWN,
454};
455
461 .state = GPIO_INPUT,
462 .pull = GPIO_PULL_UP,
463};
464
476 .state = GPIO_INPUT,
477 .pull = GPIO_PULL_KEEP,
478};
479
485static const gpio_conf_t gpio_ll_out = {
486 .state = GPIO_OUTPUT_PUSH_PULL,
487 .initial_value = false,
488};
489
496static const gpio_conf_t gpio_ll_od = {
497 .state = GPIO_OUTPUT_OPEN_DRAIN,
498 .pull = GPIO_FLOATING,
499 .initial_value = true,
500};
501
510 .state = GPIO_OUTPUT_OPEN_DRAIN,
511 .pull = GPIO_PULL_UP,
512 .initial_value = true,
513};
515#endif
516
524static inline bool is_gpio_port_num_valid(uint_fast8_t num);
525
563int gpio_ll_init(gpio_port_t port, uint8_t pin, gpio_conf_t conf);
564
580
590
596
612static inline uword_t gpio_ll_read(gpio_port_t port);
613
630
646static inline void gpio_ll_set(gpio_port_t port, uword_t mask);
647
663static inline void gpio_ll_clear(gpio_port_t port, uword_t mask);
664
680static inline void gpio_ll_toggle(gpio_port_t port, uword_t mask);
681
682#if defined(DOXYGEN) || !defined(HAVE_GPIO_LL_PREPARE_WRITE_ALL_PINS)
706 uword_t value)
707{
708 (void)port;
709 return value;
710}
711#endif
712
713#if defined(DOXYGEN) || !defined(HAVE_GPIO_LL_PREPARE_WRITE)
728 uword_t value)
729{
730 return value | (gpio_ll_read_output(port) & (~mask));
731}
732#endif
733
734#if defined(DOXYGEN) || !defined(HAVE_GPIO_LL_PREPARE_SWITCH_DIR)
744{
745 return mask;
746}
747#endif
748
759static inline void gpio_ll_switch_dir_output(gpio_port_t port, uword_t pins);
760
779static inline void gpio_ll_switch_dir_input(gpio_port_t port, uword_t pins);
780
822static inline void gpio_ll_write(gpio_port_t port, uword_t state);
823
827static inline gpio_port_t gpio_get_port(gpio_t pin);
828
832static inline uint8_t gpio_get_pin_num(gpio_t pin);
833
845static inline gpio_port_t gpio_port_pack_addr(void *addr);
846
859static inline void * gpio_port_unpack_addr(gpio_port_t port);
860
861#ifndef DOXYGEN
862#if !MODULE_PERIPH_GPIO_LL_SWITCH_DIR
863static inline void gpio_ll_switch_dir_output(gpio_port_t port, uword_t outputs)
864{
865 (void)port;
866 (void)outputs;
867 /* Hack: If this function is only used guarded by some
868 *
869 * if (IS_USED(MODULE_PERIPH_GPIO_LL_SWITCH_DIR)) {
870 * ...
871 * }
872 *
873 * as intended, all calls to the following fake function will be optimized
874 * due to the elimination of dead branches. If used incorrectly, a linking
875 * failure will be the result. The error message will not be ideal, but a
876 * compile time error is much better than a runtime error.
877 */
878 extern void gpio_ll_switch_dir_output_used_but_feature_gpio_ll_switch_dir_is_not_provided(void);
879 gpio_ll_switch_dir_output_used_but_feature_gpio_ll_switch_dir_is_not_provided();
880}
881
882static inline void gpio_ll_switch_dir_input(gpio_port_t port, uword_t inputs)
883{
884 (void)port;
885 (void)inputs;
886 /* Same hack as above */
887 extern void gpio_ll_switch_dir_input_used_but_feature_gpio_ll_switch_dir_is_not_provided(void);
888 gpio_ll_switch_dir_input_used_but_feature_gpio_ll_switch_dir_is_not_provided();
889}
890
891#endif /* !MODULE_PERIPH_GPIO_LL_SWITCH_DIR */
892#endif /* !DOXYGEN */
893
894#ifdef __cplusplus
895}
896#endif
897
898/* the hardware specific implementation relies on the types such as gpio_port_t
899 * to be provided */
900#include "gpio_ll_arch.h" /* IWYU pragma: export */
901
902#if !defined(DOXYGEN) && !defined(GPIO_PORT_NUMBERING_ALPHABETIC)
903# define GPIO_PORT_NUMBERING_ALPHABETIC 0
904#endif
905
910#if defined(GPIO_PORT_0) || defined(DOXYGEN)
914# define GPIO_PORT_A GPIO_PORT_0
915#endif
916#if defined(GPIO_PORT_1) || defined(DOXYGEN)
920# define GPIO_PORT_B GPIO_PORT_1
921#endif
922#if defined(GPIO_PORT_2) || defined(DOXYGEN)
926# define GPIO_PORT_C GPIO_PORT_2
927#endif
928#if defined(GPIO_PORT_3) || defined(DOXYGEN)
932# define GPIO_PORT_D GPIO_PORT_3
933#endif
934#if defined(GPIO_PORT_4) || defined(DOXYGEN)
938# define GPIO_PORT_E GPIO_PORT_4
939#endif
940#if defined(GPIO_PORT_5) || defined(DOXYGEN)
944# define GPIO_PORT_F GPIO_PORT_5
945#endif
946#if defined(GPIO_PORT_6) || defined(DOXYGEN)
950# define GPIO_PORT_G GPIO_PORT_6
951#endif
952#if defined(GPIO_PORT_7) || defined(DOXYGEN)
956# define GPIO_PORT_H GPIO_PORT_7
957#endif
958#if defined(GPIO_PORT_8) || defined(DOXYGEN)
962# define GPIO_PORT_I GPIO_PORT_8
963#endif
964#if defined(GPIO_PORT_9) || defined(DOXYGEN)
968# define GPIO_PORT_J GPIO_PORT_9
969#endif
970#if defined(GPIO_PORT_10) || defined(DOXYGEN)
974# define GPIO_PORT_K GPIO_PORT_10
975#endif
976#if defined(GPIO_PORT_11) || defined(DOXYGEN)
980# define GPIO_PORT_L GPIO_PORT_11
981#endif
982#if defined(GPIO_PORT_12) || defined(DOXYGEN)
986# define GPIO_PORT_M GPIO_PORT_12
987#endif
988#if defined(GPIO_PORT_13) || defined(DOXYGEN)
992# define GPIO_PORT_N GPIO_PORT_13
993#endif
994#if defined(GPIO_PORT_14) || defined(DOXYGEN)
998# define GPIO_PORT_O GPIO_PORT_14
999#endif
1000#if defined(GPIO_PORT_15) || defined(DOXYGEN)
1004# define GPIO_PORT_P GPIO_PORT_15
1005#endif
1008#endif /* PERIPH_GPIO_LL_H */
Platform-independent access to architecture details.
POSIX.1-2008 compliant version of the assert macro.
Low-level GPIO peripheral driver interface definitions.
static const gpio_conf_t gpio_ll_in_pk
A standard configuration for a generic input pin with pull resistor to keep signal at bus level.
Definition gpio_ll.h:475
static uint8_t gpio_get_pin_num(gpio_t pin)
Extract the pin number from a gpio_t
static void gpio_ll_set(gpio_port_t port, uword_t mask)
Perform an reg |= mask operation on the I/O register of the port.
gpio_pull_t
Enumeration of pull resistor configurations.
Definition gpio_ll.h:250
gpio_pull_strength_t
Enumeration of pull resistor values.
Definition gpio_ll.h:268
static const gpio_conf_t gpio_ll_in_pd
A standard configuration for a generic input pin with pull down resistor.
Definition gpio_ll.h:451
static const gpio_conf_t gpio_ll_out
A standard configuration for a generic push-pull output pin.
Definition gpio_ll.h:485
gpio_state_t
Enumeration of GPIO states (direction)
Definition gpio_ll.h:158
gpio_port_t gpio_port(uword_t num)
Get the gpio_port_t value of the port number num.
gpio_slew_t
Enumeration of slew rate settings.
Definition gpio_ll.h:332
int gpio_ll_init(gpio_port_t port, uint8_t pin, gpio_conf_t conf)
Initialize the given GPIO pin as specified.
static uword_t gpio_ll_prepare_write(gpio_port_t port, uword_t mask, uword_t value)
Helper to use gpio_ll_write side-effect free.
Definition gpio_ll.h:727
static gpio_port_t gpio_port_pack_addr(void *addr)
Pack a pointer into a gpio_port_t.
static void gpio_ll_switch_dir_output(gpio_port_t port, uword_t pins)
Turn GPIO pins specified by pins (obtained from gpio_ll_prepare_switch_dir) to outputs.
gpio_conf_t gpio_ll_query_conf(gpio_port_t port, uint8_t pin)
Retrieve the current configuration of a GPIO pin.
void gpio_ll_print_conf_common(const gpio_conf_t conf)
INTERNAL, use gpio_ll_print_conf instead.
gpio_drive_strength_t
Enumeration of drive strength options.
Definition gpio_ll.h:299
static const gpio_conf_t gpio_ll_in_pu
A standard configuration for a generic input pin with pull up resistor.
Definition gpio_ll.h:460
static void gpio_ll_switch_dir_input(gpio_port_t port, uword_t pins)
Turn GPIO pins specified by pins (obtained from gpio_ll_prepare_switch_dir) to inputs.
static uword_t gpio_ll_read(gpio_port_t port)
Get the current input value of all GPIO pins of the given port as bitmask.
static gpio_port_t gpio_get_port(gpio_t pin)
Extract the gpio_port_t from a gpio_t
static uword_t gpio_ll_prepare_write_all_outputs(gpio_port_t port, uword_t value)
Same as gpio_ll_prepare_write(port, UWORD_MAX, value), but faster.
Definition gpio_ll.h:705
typedef gpio_conf_t
GPIO pin configuration.
Definition gpio_ll.h:416
static const gpio_conf_t gpio_ll_in
A standard configuration for a generic floating input pin.
Definition gpio_ll.h:442
uword_t gpio_port_num(gpio_port_t port)
Get the number of the GPIO port port refers to.
static uword_t gpio_ll_prepare_switch_dir(uword_t mask)
Prepare bitmask for use with gpio_ll_switch_dir_output and gpio_ll_switch_dir_input.
Definition gpio_ll.h:743
static const gpio_conf_t gpio_ll_od_pu
A standard configuration for a generic open drain output with pull up.
Definition gpio_ll.h:509
static void * gpio_port_unpack_addr(gpio_port_t port)
Extract a data pointer that was packed by gpio_port_pack_addr.
static bool is_gpio_port_num_valid(uint_fast8_t num)
Check if the given number is a valid argument for gpio_port.
static uword_t gpio_ll_read_output(gpio_port_t port)
Get the current output value of all GPIO pins of the given port as bitmask.
static void gpio_ll_clear(gpio_port_t port, uword_t mask)
Perform an reg &= ~mask operation on the I/O register of the port.
static void gpio_ll_toggle(gpio_port_t port, uword_t mask)
Perform an reg ^= mask operation on the I/O register of the port.
static void gpio_ll_write(gpio_port_t port, uword_t state)
Perform a masked write operation on the I/O register of the port.
static const gpio_conf_t gpio_ll_od
A standard configuration for a generic floating open drain output.
Definition gpio_ll.h:496
uintptr_t gpio_port_t
GPIO port type.
Definition gpio_ll.h:87
void gpio_ll_print_conf(const gpio_conf_t conf)
Utility function to print a given GPIO configuration to stdio.
@ GPIO_FLOATING
No pull ups nor pull downs enabled.
Definition gpio_ll.h:251
@ GPIO_PULL_KEEP
Keep the signal at current logic level with pull up/down resistors.
Definition gpio_ll.h:254
@ GPIO_PULL_DOWN
Pull down resistor enabled.
Definition gpio_ll.h:253
@ GPIO_PULL_UP
Pull up resistor enabled.
Definition gpio_ll.h:252
@ GPIO_PULL_WEAKEST
Use the weakest (highest Ohm value) resistor.
Definition gpio_ll.h:269
@ GPIO_PULL_WEAK
Use a weak pull resistor.
Definition gpio_ll.h:270
@ GPIO_PULL_STRONG
Use a strong pull resistor.
Definition gpio_ll.h:271
@ GPIO_PULL_STRONGEST
Use the strongest pull resistor.
Definition gpio_ll.h:272
@ GPIO_OUTPUT_OPEN_SOURCE
Use pin as output in open emitter configuration.
Definition gpio_ll.h:195
@ GPIO_USED_BY_PERIPHERAL
The GPIO pin is used by a peripheral.
Definition gpio_ll.h:214
@ GPIO_OUTPUT_OPEN_DRAIN
Use pin as output in open collector configuration.
Definition gpio_ll.h:182
@ GPIO_OUTPUT_PUSH_PULL
Use pin as output in push-pull configuration.
Definition gpio_ll.h:169
@ GPIO_DISCONNECT
Disconnect pin from all peripherals.
Definition gpio_ll.h:242
@ GPIO_INPUT
Use pin as input.
Definition gpio_ll.h:201
@ GPIO_SLEW_SLOWEST
let the output voltage level rise/fall as slow as possible
Definition gpio_ll.h:333
@ GPIO_SLEW_FAST
let the output voltage level rise/fall fast
Definition gpio_ll.h:336
@ GPIO_SLEW_SLOW
let the output voltage level rise/fall slowly
Definition gpio_ll.h:335
@ GPIO_SLEW_FASTEST
let the output voltage level rise/fall as fast as possible
Definition gpio_ll.h:337
@ GPIO_DRIVE_STRONG
Use a strong drive strength.
Definition gpio_ll.h:302
@ GPIO_DRIVE_WEAK
Use a weak drive strength.
Definition gpio_ll.h:301
@ GPIO_DRIVE_STRONGEST
Use the strongest drive strength.
Definition gpio_ll.h:303
@ GPIO_DRIVE_WEAKEST
Use the weakest drive strength.
Definition gpio_ll.h:300
uint< NUM > _t uword_t
Word sized unsigned integer.
Public members of gpio_conf_t
Definition gpio_ll.h:371
uint8_t bits
The raw bits of the configuration.
Definition gpio_ll.h:372
gpio_pull_t pull
Pull resistor configuration.
Definition gpio_ll.h:381
bool initial_value
Initial value of the output.
Definition gpio_ll.h:395
gpio_state_t state
State of the pin.
Definition gpio_ll.h:377